Milk straight from the breast is warm, but milk from the fridge or freezer, just isn't. While pumped milk can be heated under running water (it should never be warmed in the microwave), there's no way to regulate the temperature to an exact degree. The Yoomi bottle ($39) is fitted with a warmer that fits into the bottle's elongated lid. Prior to a baby's feeding, push a button and wait 60 seconds. When the milk enters the bottle's nipple, it passes over the heater and is delivered at the perfect temperature for hungry lil tots. The heater obtains heat when submerged in boiling water for 25 minutes. It retains its heat until it is used.